公开(公告)号：US20180081075A1

公开(公告)日：2018-03-22

申请号：US15542169

申请日：2015-12-16

Applicant: CGG SERVICES SAS

Inventor： Adam SMIAROWSKI ,  Philip MILES

IPC: G01V3/16 ,  G01R33/00 ,  G01V3/165

CPC classification number: G01V3/16 ,  G01R33/0029 ,  G01V3/165 ,  G01V3/17

Abstract: A computing device and method for removing noise associated with an excitation signal and its odd harmonics. A computing system for processing electromagnetic (EM) signals includes an interface that receives raw data indicative of a time rate of change of a magnetic field as recorded with a receiver coil while airborne, wherein the magnetic field includes a primary source excitation; and a processor connected to the interface. The processor is configured to calculate a rotation of the receiver coil relative to a desired orientation; derotate the raw EM data based on the rotation of the receiver coil relative to the desired orientation and on the primary source excitation, to obtain derotated EM data; and generate an image of a surveyed subsurface based on the derotated EM data.